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research-article

Mechanics of a Graphene Flake Driven by the Stiffness Jump on a Graphene Substrate

[+] Author and Article Information
Hong Gao

Shanghai Institute of Applied Mathematics and Mechanics, Shanghai Key Laboratory of Mechanics in Energy Engineering, Shanghai University, Shanghai 200072, People’s Republic of China
ghgygs@126.com

Hongwei Zhang

State Key Laboratory of Ocean Engineering, School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, People’s Republic of China
hwzhang@sjtu.edu.cn

Zhengrong Guo

Shanghai Institute of Applied Mathematics and Mechanics, Shanghai Key Laboratory of Mechanics in Energy Engineering, Shanghai University, Shanghai 200072, People’s Republic of China
zrguo@shu.edu.cn

Tienchong Chang

Shanghai Institute of Applied Mathematics and Mechanics, Shanghai Key Laboratory of Mechanics in Energy Engineering, Shanghai University, Shanghai 200072, People’s Republic of China
tchang@staff.shu.edu.cn

Li-Qun Chen

Shanghai Institute of Applied Mathematics and Mechanics, Shanghai Key Laboratory of Mechanics in Energy Engineering, Shanghai University, Shanghai 200072, People’s Republic of China
lqchen@staff.shu.edu.cn

1Corresponding author.

ASME doi:10.1115/1.4036938 History: Received April 10, 2017; Revised May 28, 2017

Abstract

Intrinsic driving mechanism is of particular significance to nanoscale mass delivery and device design. Stiffness gradient driven directional motion, i.e., nanodurotaxis, provides an intrinsic driving mechanism, but an in-depth understanding of the driving force is still required. Based on molecular dynamics simulations, here we investigate the motion behavior of a graphene flake on a graphene substrate with a stiffness jump. The effects of the temperature and the stiffness configuration on the driving force are discussed in detail. It is found that the driving force is almost totally contributed by the unbalanced edge force, and increases with the temperature and the stiffness difference, but decreases with the stiffness level. We demonstrate also that the shuttle behavior of the flake between two stiffness jumps on the substrate can be controlled by the working temperature and stiffness configuration of the system. These findings may have general implications for the design of nanodevices driven by stiffness jumps.

Copyright (c) 2017 by ASME
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